Refactor language detection logic to allow non-static CLD data sources.

components/translate/content/renderer/data_file_renderer_cld_data_provider.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_TRANSLATE_CONTENT_RENDERER_DATA_FILE_RENDERER_CLD_DATA_PROVIDER_H_
 #define COMPONENTS_TRANSLATE_CONTENT_RENDERER_DATA_FILE_RENDERER_CLD_DATA_PROVIDER_H_
 
 #include "base/files/file.h"
 #include "base/macros.h"
 #include "components/translate/content/renderer/renderer_cld_data_provider.h"
 #include "ipc/ipc_platform_file.h"
 
+namespace content {
+class RenderViewObserver;
+}
+
 namespace translate {
 
 class DataFileRendererCldDataProvider : public RendererCldDataProvider {
  public:
   explicit DataFileRendererCldDataProvider(content::RenderViewObserver*);
-  virtual ~DataFileRendererCldDataProvider();
+  ~DataFileRendererCldDataProvider() override;
+
   // RendererCldDataProvider implementations:
-  virtual bool OnMessageReceived(const IPC::Message&) override;
-  virtual void SendCldDataRequest() override;
-  virtual void SetCldAvailableCallback(base::Callback<void(void)>) override;
-  virtual bool IsCldDataAvailable() override;
+  bool OnMessageReceived(const IPC::Message&) override;
+  void SendCldDataRequest() override;
+  void SetCldAvailableCallback(base::Callback<void(void)>) override;
+  bool IsCldDataAvailable() override;
 
  private:
   void OnCldDataAvailable(const IPC::PlatformFileForTransit ipc_file_handle,
                           const uint64 data_offset,
                           const uint64 data_length);
   void LoadCldData(base::File file,
                    const uint64 data_offset,
                    const uint64 data_length);
   content::RenderViewObserver* render_view_observer_;
   base::Callback<void(void)> cld_available_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(DataFileRendererCldDataProvider);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_CONTENT_RENDERER_DATA_FILE_RENDERER_CLD_DATA_PROVIDER_H_